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Looking to build an airsoft mortar

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Looking to build an airsoft mortar

Unread postAuthor: timebmb757 » Sun Feb 21, 2010 10:32 pm

Similar to this one:
http://www.youtube.com/watch?v=FVaPVzxFj4k

Now, by the looks of it, this one uses a QEV valve with some sort of trigger that I cant really identify due to the quality of the video.

What Im trying to figure out is how does he make it fire more than once without having to refill the really small looking pressure chamber, and how does that trigger work?

Any ideas?
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Unread postAuthor: Lockednloaded » Sun Feb 21, 2010 10:39 pm

I have looked at this quite abit as well.. he uses a slide valve to trigger it, but it is hooked up to an air source, probably a paintball tank. Take a look at my semi auto discussion in the pneumatic cannon discussion thread, it should help you.
EDIT:: Link found posted below
http://www.spudfiles.com/forums/semi-auto-t20061.html
hope this helps :)
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Unread postAuthor: timebmb757 » Sun Feb 21, 2010 11:18 pm

Thanks a ton dude. That helped alot.

Another question, is it ok to use CO2 with QEVs? Specifically the one listed in your thread Lockedandloaded.


Also, anyone have any good ideas for a bipod?
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Unread postAuthor: deathbyDWV » Mon Feb 22, 2010 12:17 am

How he gets multiple shots is... He has a co2 source connected to the other side of the slide valve. The hose is hidden behind his arm...
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Unread postAuthor: timebmb757 » Mon Feb 22, 2010 6:27 am

deathbyDWV wrote:How he gets multiple shots is... He has a co2 source connected to the other side of the slide valve. The hose is hidden behind his arm...


Impossible, where would the QEV be venting to in that case?
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Unread postAuthor: MrCrowley » Mon Feb 22, 2010 6:58 am

timebmb757 wrote:
deathbyDWV wrote:How he gets multiple shots is... He has a co2 source connected to the other side of the slide valve. The hose is hidden behind his arm...


Impossible, where would the QEV be venting to in that case?

Out of the slide valve...when you trigger a slide valve, it closes the air input and vents the pilot. When it goes back in to position it closes the pilot vent and fills the cannon. You can see a leaf move by his hand everytime he triggers it.
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Unread postAuthor: timebmb757 » Mon Feb 22, 2010 4:28 pm

MrCrowley wrote:
timebmb757 wrote:
deathbyDWV wrote:How he gets multiple shots is... He has a co2 source connected to the other side of the slide valve. The hose is hidden behind his arm...


Impossible, where would the QEV be venting to in that case?

Out of the slide valve...when you trigger a slide valve, it closes the air input and vents the pilot. When it goes back in to position it closes the pilot vent and fills the cannon. You can see a leaf move by his hand everytime he triggers it.


I stand quite corrected.
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